This when was the dominant sort of UPS and is also limited to around the a hundred and fifty kVA selection. These units are still predominantly utilized in some industrial configurations (oil and fuel, petrochemical, chemical, utility, and heavy field markets) as a result of sturdy character of the UPS. https://mixedmartialarts62615.livebloggs.com/40194781/the-definitive-guide-to-uninterruptible-power-supply-calculator